Improvement in grate-bars



y 2 is a top view of the same.

spending parts.

structed that its deep except at ,the ends that rest upon the'grate-frame or seat. Bare the fire-bars, which UNITED STATESIMPROVEMENT. IN GRATE-BARS.

Specification forming part of Letters Patent No. 131,641, datedSeptember 24, 1872.

To all whom it may concern:

Be it known that we, PIIILIP UMHOLTZ and AUGUSTUS UMIIoLTz, of Tremont,in the county of Schuylkill and State of Pennsylvania, have invented anew and useful Improvement in Grate-Bars, of which the following is aspecification:

In the accompanying drawing, Figure lis a` side view of our improvedgrate-bar; and Fig.

Similar letters of reference indicate corre- ()ur invention has for itsobject to furnish anilnproved grate-bar, which shall be so conparts mayexpand lfreely in all directions without breakingor straining saidparts, and Without interfering with each other; and it consists in theconstruction and combination of the various parts, as hereinafter morefully described.

A is the main or carrying bar, which is made are cast upon the upperedge of the carryingbar A so as to project equally upon each Side ofsaid bar. The ire-bars B are made deeper at their middle parts, andJtaper gradually upon their lower sides toward their ends, as Shown inFig. l. The nre-bars B project an inch or morel above the carrying-barA, so that the cold air may pass between the top of the carrying-bar Aand the ire and thus in a-measure Vprotect the v said carrying-bar fromthe heat. The fire-bars B are arranged obliquely with respect to thecarrying-bar A, and they are grooved longitudinally upon their uppersides to retain ashes to protect the said bars fromthe heat, thediagonal position of the bars B preventing the said ashes from beingremoved by the scraper, and preventing the scraper from catching uponthe said bars. The outer ends of the last two inclined bars B, at eachend of the grate-bar, are cut off, and the angular space left at theside of the inner end of the lastinclined bar B is iilledup with twoshort bars at right angles with the carryingbar A. The bars B at theends of the gratebar are made as deep as the shoulders at the ends ofthe carrying-bar A, as shown in Fig.

1. By this construction the ends of the, irebars, being left entirelyfree, can expand'in any direction as the fire may be hotter in one partthan in another, so that the parts will not interfere with each other orbe strained or broken.

Having thus described claim as new, Patent- AS a new article ofmanufacture, the compound grate-bar described, consisting of the centerbar A andthe top-grooved and freeended re-bars B, constructed andrelatively arranged, as Shown and described, for the purpose Set forth.A

PHILIP UMHOLTZ. AUGUSTUS UMHOLTZ.

our invention, We anddesire to secure by Letters VWitnesses:

JAMES BROWERS, JOHN BECIITEL.

